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gecko-dev/layout/svg/nsSVGPathGeometryFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// Main header first:
#include "nsSVGPathGeometryFrame.h"
// Keep others in (case-insensitive) order:
#include "gfx2DGlue.h"
#include "gfxContext.h"
#include "gfxPlatform.h"
#include "gfxSVGGlyphs.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/RefPtr.h"
#include "nsDisplayList.h"
#include "nsGkAtoms.h"
#include "nsLayoutUtils.h"
#include "nsRenderingContext.h"
#include "nsSVGEffects.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGMarkerFrame.h"
#include "nsSVGPathGeometryElement.h"
#include "nsSVGUtils.h"
#include "mozilla/ArrayUtils.h"
#include "SVGAnimatedTransformList.h"
#include "SVGContentUtils.h"
#include "SVGGraphicsElement.h"
using namespace mozilla;
using namespace mozilla::gfx;
//----------------------------------------------------------------------
// Implementation
nsIFrame*
NS_NewSVGPathGeometryFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext)
{
return new (aPresShell) nsSVGPathGeometryFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGPathGeometryFrame)
//----------------------------------------------------------------------
// nsQueryFrame methods
NS_QUERYFRAME_HEAD(nsSVGPathGeometryFrame)
NS_QUERYFRAME_ENTRY(nsISVGChildFrame)
NS_QUERYFRAME_ENTRY(nsSVGPathGeometryFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsSVGPathGeometryFrameBase)
//----------------------------------------------------------------------
// Display list item:
class nsDisplaySVGPathGeometry : public nsDisplayItem {
public:
nsDisplaySVGPathGeometry(nsDisplayListBuilder* aBuilder,
nsSVGPathGeometryFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame)
{
MOZ_COUNT_CTOR(nsDisplaySVGPathGeometry);
NS_ABORT_IF_FALSE(aFrame, "Must have a frame!");
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplaySVGPathGeometry() {
MOZ_COUNT_DTOR(nsDisplaySVGPathGeometry);
}
#endif
NS_DISPLAY_DECL_NAME("nsDisplaySVGPathGeometry", TYPE_SVG_PATH_GEOMETRY)
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames);
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx);
};
void
nsDisplaySVGPathGeometry::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames)
{
nsSVGPathGeometryFrame *frame = static_cast<nsSVGPathGeometryFrame*>(mFrame);
nsPoint pointRelativeToReferenceFrame = aRect.Center();
// ToReferenceFrame() includes frame->GetPosition(), our user space position.
nsPoint userSpacePtInAppUnits = pointRelativeToReferenceFrame -
(ToReferenceFrame() - frame->GetPosition());
gfxPoint userSpacePt =
gfxPoint(userSpacePtInAppUnits.x, userSpacePtInAppUnits.y) /
frame->PresContext()->AppUnitsPerCSSPixel();
if (frame->GetFrameForPoint(userSpacePt)) {
aOutFrames->AppendElement(frame);
}
}
void
nsDisplaySVGPathGeometry::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
uint32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
// ToReferenceFrame includes our mRect offset, but painting takes
// account of that too. To avoid double counting, we subtract that
// here.
nsPoint offset = ToReferenceFrame() - mFrame->GetPosition();
gfxPoint devPixelOffset =
nsLayoutUtils::PointToGfxPoint(offset, appUnitsPerDevPixel);
aCtx->PushState();
gfxMatrix tm = nsSVGIntegrationUtils::GetCSSPxToDevPxMatrix(mFrame) *
gfxMatrix::Translation(devPixelOffset);
static_cast<nsSVGPathGeometryFrame*>(mFrame)->PaintSVG(aCtx, tm);
aCtx->PopState();
}
//----------------------------------------------------------------------
// nsIFrame methods
void
nsSVGPathGeometryFrame::Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow)
{
AddStateBits(aParent->GetStateBits() & NS_STATE_SVG_CLIPPATH_CHILD);
nsSVGPathGeometryFrameBase::Init(aContent, aParent, aPrevInFlow);
}
nsresult
nsSVGPathGeometryFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
// We don't invalidate for transform changes (the layers code does that).
// Also note that SVGTransformableElement::GetAttributeChangeHint will
// return nsChangeHint_UpdateOverflow for "transform" attribute changes
// and cause DoApplyRenderingChangeToTree to make the SchedulePaint call.
if (aNameSpaceID == kNameSpaceID_None &&
(static_cast<nsSVGPathGeometryElement*>
(mContent)->AttributeDefinesGeometry(aAttribute))) {
nsSVGEffects::InvalidateRenderingObservers(this);
nsSVGUtils::ScheduleReflowSVG(this);
}
return NS_OK;
}
/* virtual */ void
nsSVGPathGeometryFrame::DidSetStyleContext(nsStyleContext* aOldStyleContext)
{
nsSVGPathGeometryFrameBase::DidSetStyleContext(aOldStyleContext);
if (aOldStyleContext) {
float oldOpacity = aOldStyleContext->PeekStyleDisplay()->mOpacity;
float newOpacity = StyleDisplay()->mOpacity;
if (newOpacity != oldOpacity &&
nsSVGUtils::CanOptimizeOpacity(this)) {
// nsIFrame::BuildDisplayListForStackingContext() is not going to create an
// nsDisplayOpacity display list item, so DLBI won't invalidate for us.
InvalidateFrame();
}
}
}
nsIAtom *
nsSVGPathGeometryFrame::GetType() const
{
return nsGkAtoms::svgPathGeometryFrame;
}
bool
nsSVGPathGeometryFrame::IsSVGTransformed(gfx::Matrix *aOwnTransform,
gfx::Matrix *aFromParentTransform) const
{
bool foundTransform = false;
// Check if our parent has children-only transforms:
nsIFrame *parent = GetParent();
if (parent &&
parent->IsFrameOfType(nsIFrame::eSVG | nsIFrame::eSVGContainer)) {
foundTransform = static_cast<nsSVGContainerFrame*>(parent)->
HasChildrenOnlyTransform(aFromParentTransform);
}
nsSVGElement *content = static_cast<nsSVGElement*>(mContent);
nsSVGAnimatedTransformList* transformList =
content->GetAnimatedTransformList();
if ((transformList && transformList->HasTransform()) ||
content->GetAnimateMotionTransform()) {
if (aOwnTransform) {
*aOwnTransform = gfx::ToMatrix(content->PrependLocalTransformsTo(gfxMatrix(),
nsSVGElement::eUserSpaceToParent));
}
foundTransform = true;
}
return foundTransform;
}
void
nsSVGPathGeometryFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
if (!static_cast<const nsSVGElement*>(mContent)->HasValidDimensions()) {
return;
}
aLists.Content()->AppendNewToTop(
new (aBuilder) nsDisplaySVGPathGeometry(aBuilder, this));
}
//----------------------------------------------------------------------
// nsISVGChildFrame methods
nsresult
nsSVGPathGeometryFrame::PaintSVG(nsRenderingContext *aContext,
const gfxMatrix& aTransform,
const nsIntRect* aDirtyRect)
{
if (!StyleVisibility()->IsVisible())
return NS_OK;
uint32_t paintOrder = StyleSVG()->mPaintOrder;
if (paintOrder == NS_STYLE_PAINT_ORDER_NORMAL) {
Render(aContext, eRenderFill | eRenderStroke, aTransform);
PaintMarkers(aContext, aTransform);
} else {
while (paintOrder) {
uint32_t component =
paintOrder & ((1 << NS_STYLE_PAINT_ORDER_BITWIDTH) - 1);
switch (component) {
case NS_STYLE_PAINT_ORDER_FILL:
Render(aContext, eRenderFill, aTransform);
break;
case NS_STYLE_PAINT_ORDER_STROKE:
Render(aContext, eRenderStroke, aTransform);
break;
case NS_STYLE_PAINT_ORDER_MARKERS:
PaintMarkers(aContext, aTransform);
break;
}
paintOrder >>= NS_STYLE_PAINT_ORDER_BITWIDTH;
}
}
return NS_OK;
}
nsIFrame*
nsSVGPathGeometryFrame::GetFrameForPoint(const gfxPoint& aPoint)
{
FillRule fillRule;
uint16_t hitTestFlags;
if (GetStateBits() & NS_STATE_SVG_CLIPPATH_CHILD) {
hitTestFlags = SVG_HIT_TEST_FILL;
fillRule = StyleSVG()->mClipRule == NS_STYLE_FILL_RULE_NONZERO
? FillRule::FILL_WINDING : FillRule::FILL_EVEN_ODD;
} else {
hitTestFlags = GetHitTestFlags();
if (!hitTestFlags) {
return nullptr;
}
if (hitTestFlags & SVG_HIT_TEST_CHECK_MRECT) {
gfxRect rect =
nsLayoutUtils::RectToGfxRect(mRect, PresContext()->AppUnitsPerCSSPixel());
if (!rect.Contains(aPoint)) {
return nullptr;
}
}
fillRule = StyleSVG()->mFillRule == NS_STYLE_FILL_RULE_NONZERO
? FillRule::FILL_WINDING : FillRule::FILL_EVEN_ODD;
}
bool isHit = false;
nsSVGPathGeometryElement* content =
static_cast<nsSVGPathGeometryElement*>(mContent);
// Using ScreenReferenceDrawTarget() opens us to Moz2D backend specific hit-
// testing bugs. Maybe we should use a BackendType::CAIRO DT for hit-testing
// so that we get more consistent/backwards compatible results?
RefPtr<DrawTarget> drawTarget =
gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
RefPtr<PathBuilder> builder =
drawTarget->CreatePathBuilder(fillRule);
RefPtr<Path> path = content->BuildPath(builder);
if (!path) {
return nullptr; // no path, so we don't paint anything that can be hit
}
if (hitTestFlags & SVG_HIT_TEST_FILL) {
isHit = path->ContainsPoint(ToPoint(aPoint), Matrix());
}
if (!isHit && (hitTestFlags & SVG_HIT_TEST_STROKE)) {
Point point = ToPoint(aPoint);
SVGContentUtils::AutoStrokeOptions stroke;
SVGContentUtils::GetStrokeOptions(&stroke, content, StyleContext(), nullptr);
Matrix nonScalingStrokeMatrix = ToMatrix(nsSVGUtils::GetStrokeTransform(this));
if (!nonScalingStrokeMatrix.IsIdentity()) {
// We need to transform the path back into the appropriate ancestor
// coordinate system in order for non-scaled stroke to be correct.
// Naturally we also need to transform the point into the same
// coordinate system in order to hit-test against the path.
if (!nonScalingStrokeMatrix.Invert()) {
return nullptr;
}
point = nonScalingStrokeMatrix * point;
RefPtr<PathBuilder> builder =
path->TransformedCopyToBuilder(nonScalingStrokeMatrix, fillRule);
path = builder->Finish();
}
isHit = path->StrokeContainsPoint(stroke, point, Matrix());
}
if (isHit && nsSVGUtils::HitTestClip(this, aPoint))
return this;
return nullptr;
}
nsRect
nsSVGPathGeometryFrame::GetCoveredRegion()
{
return nsSVGUtils::TransformFrameRectToOuterSVG(
mRect, GetCanvasTM(), PresContext());
}
void
nsSVGPathGeometryFrame::ReflowSVG()
{
NS_ASSERTION(nsSVGUtils::OuterSVGIsCallingReflowSVG(this),
"This call is probably a wasteful mistake");
NS_ABORT_IF_FALSE(!(GetStateBits() & NS_FRAME_IS_NONDISPLAY),
"ReflowSVG mechanism not designed for this");
if (!nsSVGUtils::NeedsReflowSVG(this)) {
return;
}
uint32_t flags = nsSVGUtils::eBBoxIncludeFill |
nsSVGUtils::eBBoxIncludeStroke |
nsSVGUtils::eBBoxIncludeMarkers;
// Our "visual" overflow rect needs to be valid for building display lists
// for hit testing, which means that for certain values of 'pointer-events'
// it needs to include the geometry of the fill or stroke even when the fill/
// stroke don't actually render (e.g. when stroke="none" or
// stroke-opacity="0"). GetHitTestFlags() accounts for 'pointer-events'.
uint16_t hitTestFlags = GetHitTestFlags();
if ((hitTestFlags & SVG_HIT_TEST_FILL)) {
flags |= nsSVGUtils::eBBoxIncludeFillGeometry;
}
if ((hitTestFlags & SVG_HIT_TEST_STROKE)) {
flags |= nsSVGUtils::eBBoxIncludeStrokeGeometry;
}
// We'd like to just pass the identity matrix to GetBBoxContribution, but if
// this frame's user space size is _very_ large/small then the extents we
// obtain below might have overflowed or otherwise be broken. This would
// cause us to end up with a broken mRect and visual overflow rect and break
// painting of this frame. This is particularly noticeable if the transforms
// between us and our nsSVGOuterSVGFrame scale this frame to a reasonable
// size. To avoid this we sadly have to do extra work to account for the
// transforms between us and our nsSVGOuterSVGFrame, even though the
// overwhelming number of SVGs will never have this problem.
// XXX Will Azure eventually save us from having to do this?
gfxSize scaleFactors = GetCanvasTM().ScaleFactors(true);
bool applyScaling = fabs(scaleFactors.width) >= 1e-6 &&
fabs(scaleFactors.height) >= 1e-6;
gfx::Matrix scaling;
if (applyScaling) {
scaling.Scale(scaleFactors.width, scaleFactors.height);
}
gfxRect extent = GetBBoxContribution(scaling, flags).ToThebesRect();
if (applyScaling) {
extent.Scale(1 / scaleFactors.width, 1 / scaleFactors.height);
}
mRect = nsLayoutUtils::RoundGfxRectToAppRect(extent,
PresContext()->AppUnitsPerCSSPixel());
if (mState & NS_FRAME_FIRST_REFLOW) {
// Make sure we have our filter property (if any) before calling
// FinishAndStoreOverflow (subsequent filter changes are handled off
// nsChangeHint_UpdateEffects):
nsSVGEffects::UpdateEffects(this);
}
nsRect overflow = nsRect(nsPoint(0,0), mRect.Size());
nsOverflowAreas overflowAreas(overflow, overflow);
FinishAndStoreOverflow(overflowAreas, mRect.Size());
mState &= ~(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_DIRTY |
NS_FRAME_HAS_DIRTY_CHILDREN);
// Invalidate, but only if this is not our first reflow (since if it is our
// first reflow then we haven't had our first paint yet).
if (!(GetParent()->GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
InvalidateFrame();
}
}
void
nsSVGPathGeometryFrame::NotifySVGChanged(uint32_t aFlags)
{
NS_ABORT_IF_FALSE(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
"Invalidation logic may need adjusting");
// Changes to our ancestors may affect how we render when we are rendered as
// part of our ancestor (specifically, if our coordinate context changes size
// and we have percentage lengths defining our geometry, then we need to be
// reflowed). However, ancestor changes cannot affect how we render when we
// are rendered as part of any rendering observers that we may have.
// Therefore no need to notify rendering observers here.
// Don't try to be too smart trying to avoid the ScheduleReflowSVG calls
// for the stroke properties examined below. Checking HasStroke() is not
// enough, since what we care about is whether we include the stroke in our
// overflow rects or not, and we sometimes deliberately include stroke
// when it's not visible. See the complexities of GetBBoxContribution.
if (aFlags & COORD_CONTEXT_CHANGED) {
// Stroke currently contributes to our mRect, which is why we have to take
// account of stroke-width here. Note that we do not need to take account
// of stroke-dashoffset since, although that can have a percentage value
// that is resolved against our coordinate context, it does not affect our
// mRect.
if (static_cast<nsSVGPathGeometryElement*>(mContent)->GeometryDependsOnCoordCtx() ||
StyleSVG()->mStrokeWidth.HasPercent()) {
nsSVGUtils::ScheduleReflowSVG(this);
}
}
if ((aFlags & TRANSFORM_CHANGED) &&
StyleSVGReset()->mVectorEffect ==
NS_STYLE_VECTOR_EFFECT_NON_SCALING_STROKE) {
// Stroke currently contributes to our mRect, and our stroke depends on
// the transform to our outer-<svg> if |vector-effect:non-scaling-stroke|.
nsSVGUtils::ScheduleReflowSVG(this);
}
}
SVGBBox
nsSVGPathGeometryFrame::GetBBoxContribution(const Matrix &aToBBoxUserspace,
uint32_t aFlags)
{
SVGBBox bbox;
if (aToBBoxUserspace.IsSingular()) {
// XXX ReportToConsole
return bbox;
}
RefPtr<DrawTarget> tmpDT;
#ifdef XP_WIN
// Unfortunately D2D backed DrawTarget produces bounds with rounding errors
// when whole number results are expected, even in the case of trivial
// calculations. To avoid that and meet the expectations of web content we
// have to use a CAIRO DrawTarget. The most efficient way to do that is to
// wrap the cached cairo_surface_t from ScreenReferenceSurface():
nsRefPtr<gfxASurface> refSurf =
gfxPlatform::GetPlatform()->ScreenReferenceSurface();
tmpDT = gfxPlatform::GetPlatform()->
CreateDrawTargetForSurface(refSurf, IntSize(1, 1));
#else
tmpDT = gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
#endif
nsRefPtr<gfxContext> tmpCtx = new gfxContext(tmpDT);
GeneratePath(tmpCtx, aToBBoxUserspace);
tmpCtx->IdentityMatrix();
// Be careful when replacing the following logic to get the fill and stroke
// extents independently (instead of computing the stroke extents from the
// path extents). You may think that you can just use the stroke extents if
// there is both a fill and a stroke. In reality it's necessary to calculate
// both the fill and stroke extents, and take the union of the two. There are
// two reasons for this:
//
// # Due to stroke dashing, in certain cases the fill extents could actually
// extend outside the stroke extents.
// # If the stroke is very thin, cairo won't paint any stroke, and so the
// stroke bounds that it will return will be empty.
gfxRect pathExtents = tmpCtx->GetUserPathExtent();
// Account for fill:
if ((aFlags & nsSVGUtils::eBBoxIncludeFillGeometry) ||
((aFlags & nsSVGUtils::eBBoxIncludeFill) &&
StyleSVG()->mFill.mType != eStyleSVGPaintType_None)) {
bbox = pathExtents;
}
// Account for stroke:
if ((aFlags & nsSVGUtils::eBBoxIncludeStrokeGeometry) ||
((aFlags & nsSVGUtils::eBBoxIncludeStroke) &&
nsSVGUtils::HasStroke(this))) {
// We can't use tmpCtx->GetUserStrokeExtent() since it doesn't work for
// device space extents. Instead we approximate the stroke extents from
// pathExtents using PathExtentsToMaxStrokeExtents.
if (pathExtents.Width() <= 0 && pathExtents.Height() <= 0) {
// We have a zero length path, but it may still have non-empty stroke
// bounds depending on the value of stroke-linecap. We need to fix up
// pathExtents before it can be used with PathExtentsToMaxStrokeExtents
// though, because if pathExtents is empty, its position will not have
// been set. Happily we can use tmpCtx->GetUserStrokeExtent() to find
// the center point of the extents even though it gets the extents wrong.
nsSVGUtils::SetupCairoStrokeBBoxGeometry(this, tmpCtx);
pathExtents.MoveTo(tmpCtx->GetUserStrokeExtent().Center());
pathExtents.SizeTo(0, 0);
}
bbox.UnionEdges(nsSVGUtils::PathExtentsToMaxStrokeExtents(pathExtents,
this,
ThebesMatrix(aToBBoxUserspace)));
}
// Account for markers:
if ((aFlags & nsSVGUtils::eBBoxIncludeMarkers) != 0 &&
static_cast<nsSVGPathGeometryElement*>(mContent)->IsMarkable()) {
float strokeWidth = nsSVGUtils::GetStrokeWidth(this);
MarkerProperties properties = GetMarkerProperties(this);
if (properties.MarkersExist()) {
nsTArray<nsSVGMark> marks;
static_cast<nsSVGPathGeometryElement*>(mContent)->GetMarkPoints(&marks);
uint32_t num = marks.Length();
// These are in the same order as the nsSVGMark::Type constants.
nsSVGMarkerFrame* markerFrames[] = {
properties.GetMarkerStartFrame(),
properties.GetMarkerMidFrame(),
properties.GetMarkerEndFrame(),
};
PR_STATIC_ASSERT(MOZ_ARRAY_LENGTH(markerFrames) == nsSVGMark::eTypeCount);
for (uint32_t i = 0; i < num; i++) {
nsSVGMark& mark = marks[i];
nsSVGMarkerFrame* frame = markerFrames[mark.type];
if (frame) {
SVGBBox mbbox =
frame->GetMarkBBoxContribution(aToBBoxUserspace, aFlags, this,
&marks[i], strokeWidth);
bbox.UnionEdges(mbbox);
}
}
}
}
return bbox;
}
//----------------------------------------------------------------------
// nsSVGPathGeometryFrame methods:
gfxMatrix
nsSVGPathGeometryFrame::GetCanvasTM()
{
NS_ASSERTION(GetParent(), "null parent");
nsSVGContainerFrame *parent = static_cast<nsSVGContainerFrame*>(GetParent());
dom::SVGGraphicsElement *content = static_cast<dom::SVGGraphicsElement*>(mContent);
return content->PrependLocalTransformsTo(parent->GetCanvasTM());
}
nsSVGPathGeometryFrame::MarkerProperties
nsSVGPathGeometryFrame::GetMarkerProperties(nsSVGPathGeometryFrame *aFrame)
{
NS_ASSERTION(!aFrame->GetPrevContinuation(), "aFrame should be first continuation");
MarkerProperties result;
const nsStyleSVG *style = aFrame->StyleSVG();
result.mMarkerStart =
nsSVGEffects::GetMarkerProperty(style->mMarkerStart, aFrame,
nsSVGEffects::MarkerBeginProperty());
result.mMarkerMid =
nsSVGEffects::GetMarkerProperty(style->mMarkerMid, aFrame,
nsSVGEffects::MarkerMiddleProperty());
result.mMarkerEnd =
nsSVGEffects::GetMarkerProperty(style->mMarkerEnd, aFrame,
nsSVGEffects::MarkerEndProperty());
return result;
}
nsSVGMarkerFrame *
nsSVGPathGeometryFrame::MarkerProperties::GetMarkerStartFrame()
{
if (!mMarkerStart)
return nullptr;
return static_cast<nsSVGMarkerFrame *>
(mMarkerStart->GetReferencedFrame(nsGkAtoms::svgMarkerFrame, nullptr));
}
nsSVGMarkerFrame *
nsSVGPathGeometryFrame::MarkerProperties::GetMarkerMidFrame()
{
if (!mMarkerMid)
return nullptr;
return static_cast<nsSVGMarkerFrame *>
(mMarkerMid->GetReferencedFrame(nsGkAtoms::svgMarkerFrame, nullptr));
}
nsSVGMarkerFrame *
nsSVGPathGeometryFrame::MarkerProperties::GetMarkerEndFrame()
{
if (!mMarkerEnd)
return nullptr;
return static_cast<nsSVGMarkerFrame *>
(mMarkerEnd->GetReferencedFrame(nsGkAtoms::svgMarkerFrame, nullptr));
}
void
nsSVGPathGeometryFrame::Render(nsRenderingContext *aContext,
uint32_t aRenderComponents,
const gfxMatrix& aTransform)
{
gfxContext *gfx = aContext->ThebesContext();
uint16_t renderMode = SVGAutoRenderState::GetRenderMode(aContext);
switch (StyleSVG()->mShapeRendering) {
case NS_STYLE_SHAPE_RENDERING_OPTIMIZESPEED:
case NS_STYLE_SHAPE_RENDERING_CRISPEDGES:
gfx->SetAntialiasMode(gfxContext::MODE_ALIASED);
break;
default:
gfx->SetAntialiasMode(gfxContext::MODE_COVERAGE);
break;
}
if (renderMode != SVGAutoRenderState::NORMAL) {
NS_ABORT_IF_FALSE(renderMode == SVGAutoRenderState::CLIP ||
renderMode == SVGAutoRenderState::CLIP_MASK,
"Unknown render mode");
// In the case that |renderMode == SVGAutoRenderState::CLIP| then we don't
// use the path we generate here until further up the call stack when
// nsSVGClipPathFrame::Clip calls gfxContext::Clip. That's a problem for
// Moz2D which emits paths in user space (unlike cairo which emits paths in
// device space). gfxContext has hacks to deal with code changing the
// transform then using the current path when it is backed by Moz2D, but
// Moz2D itself does not since that would fundamentally go against its API.
// Therefore we do not want to Save()/Restore() the gfxContext here in the
// SVGAutoRenderState::CLIP case since that would block us from killing off
// gfxContext and using Moz2D directly. Not bothering to Save()/Restore()
// is actually okay, since we know that doesn't matter in the
// SVGAutoRenderState::CLIP case (at least for the current implementation).
gfxContextMatrixAutoSaveRestore autoSaveRestore;
// For now revent back to doing the save even for CLIP to fix bug 959128.
// Undo in bug 987193.
//if (renderMode != SVGAutoRenderState::CLIP) {
autoSaveRestore.SetContext(gfx);
//}
GeneratePath(gfx, ToMatrix(aTransform));
// We used to call gfx->Restore() here, since for the
// SVGAutoRenderState::CLIP case it is important to leave the fill rule
// that we set below untouched so that the value is still set when return
// to gfxContext::Clip() further up the call stack. Since we no longer
// call gfx->Save() in the SVGAutoRenderState::CLIP case we don't need to
// worry that autoSaveRestore will delay the Restore() call for the
// CLIP_MASK case until we exit this function.
gfxContext::FillRule oldFillRull = gfx->CurrentFillRule();
if (StyleSVG()->mClipRule == NS_STYLE_FILL_RULE_EVENODD)
gfx->SetFillRule(gfxContext::FILL_RULE_EVEN_ODD);
else
gfx->SetFillRule(gfxContext::FILL_RULE_WINDING);
if (renderMode == SVGAutoRenderState::CLIP_MASK) {
gfx->SetColor(gfxRGBA(1.0f, 1.0f, 1.0f, 1.0f));
gfx->Fill();
gfx->SetFillRule(oldFillRull); // restore, but only for CLIP_MASK
gfx->NewPath();
}
return;
}
gfxContextAutoSaveRestore autoSaveRestore(gfx);
GeneratePath(gfx, ToMatrix(aTransform));
gfxTextContextPaint *contextPaint =
(gfxTextContextPaint*)aContext->GetDrawTarget()->GetUserData(&gfxTextContextPaint::sUserDataKey);
if ((aRenderComponents & eRenderFill) &&
nsSVGUtils::SetupCairoFillPaint(this, gfx, contextPaint)) {
gfx->Fill();
}
if ((aRenderComponents & eRenderStroke) &&
nsSVGUtils::SetupCairoStroke(this, gfx, contextPaint)) {
gfx->Stroke();
}
gfx->NewPath();
}
void
nsSVGPathGeometryFrame::GeneratePath(gfxContext* aContext,
const Matrix &aTransform)
{
if (aTransform.IsSingular()) {
aContext->IdentityMatrix();
aContext->NewPath();
return;
}
aContext->MultiplyAndNudgeToIntegers(ThebesMatrix(aTransform));
// Hack to let SVGPathData::ConstructPath know if we have square caps:
const nsStyleSVG* style = StyleSVG();
if (style->mStrokeLinecap == NS_STYLE_STROKE_LINECAP_SQUARE) {
aContext->SetLineCap(gfxContext::LINE_CAP_SQUARE);
}
aContext->NewPath();
static_cast<nsSVGPathGeometryElement*>(mContent)->ConstructPath(aContext);
}
void
nsSVGPathGeometryFrame::PaintMarkers(nsRenderingContext* aContext,
const gfxMatrix& aTransform)
{
gfxTextContextPaint *contextPaint =
(gfxTextContextPaint*)aContext->GetDrawTarget()->GetUserData(&gfxTextContextPaint::sUserDataKey);
if (static_cast<nsSVGPathGeometryElement*>(mContent)->IsMarkable()) {
MarkerProperties properties = GetMarkerProperties(this);
if (properties.MarkersExist()) {
float strokeWidth = nsSVGUtils::GetStrokeWidth(this, contextPaint);
nsTArray<nsSVGMark> marks;
static_cast<nsSVGPathGeometryElement*>
(mContent)->GetMarkPoints(&marks);
uint32_t num = marks.Length();
if (num) {
// These are in the same order as the nsSVGMark::Type constants.
nsSVGMarkerFrame* markerFrames[] = {
properties.GetMarkerStartFrame(),
properties.GetMarkerMidFrame(),
properties.GetMarkerEndFrame(),
};
PR_STATIC_ASSERT(MOZ_ARRAY_LENGTH(markerFrames) == nsSVGMark::eTypeCount);
for (uint32_t i = 0; i < num; i++) {
nsSVGMark& mark = marks[i];
nsSVGMarkerFrame* frame = markerFrames[mark.type];
if (frame) {
frame->PaintMark(aContext, aTransform, this, &mark, strokeWidth);
}
}
}
}
}
}
uint16_t
nsSVGPathGeometryFrame::GetHitTestFlags()
{
return nsSVGUtils::GetGeometryHitTestFlags(this);
}
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